upgrade build config

.gitignore

@@ -13,4 +13,5 @@ tmp*
 env/
 spike*
 petl.egg-info
-
+petl/version.py
+pip-wheel-metadata

petl/__init__.py

@@ -1,9 +1,7 @@
 from __future__ import absolute_import, print_function, division
 
 
-__version__ = '1.2.0'
-
-
+from petl.version import version as __version__
 from petl import comparison
 from petl.comparison import Comparable
 from petl import util

pyproject.toml

@@ -0,0 +1,2 @@
+[build-system]
+requires = ["setuptools", "setuptools-scm", "wheel"]

setup.py

@@ -1,41 +1,33 @@
 from __future__ import print_function, absolute_import, division
-
-
-from ast import literal_eval
-from setuptools import setup
-
-
-def get_version(source='petl/__init__.py'):
-    with open(source) as f:
-        for line in f:
-            if line.startswith('__version__'):
-                return literal_eval(line.split('=')[-1].lstrip())
-    raise ValueError("__version__ not found")
+from setuptools import setup, find_packages
 
 
 setup(
     name='petl',
-    version=get_version(),
     author='Alistair Miles',
     author_email='[email protected]',
     package_dir={'': '.'},
-    packages=['petl', 'petl.io', 'petl.transform', 'petl.util',
-              'petl.test', 'petl.test.io', 'petl.test.transform',
-              'petl.test.util'],
+    packages=find_packages('.'),
     scripts=['bin/petl'],
-    url='https://github.com/alimanfoo/petl',
+    url='https://github.com/petl-developers/petl',
     license='MIT License',
     description='A Python package for extracting, transforming and loading '
                 'tables of data.',
     long_description=open('README.txt').read(),
     python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*',
+    setup_requires=["setuptools>18.0", "setuptools-scm>1.5.4"],
+    use_scm_version={
+        "version_scheme": "guess-next-dev",
+        "local_scheme": "dirty-tag",
+        "write_to": "petl/version.py",
+    },
     classifiers=['Intended Audience :: Developers',
                  'License :: OSI Approved :: MIT License',
                  'Programming Language :: Python :: 2',
                  'Programming Language :: Python :: 2.7',
                  'Programming Language :: Python :: 3',
-                 'Programming Language :: Python :: 3.4',
-                 'Programming Language :: Python :: 3.5',
+                 'Programming Language :: Python :: 3.6',
+                 'Programming Language :: Python :: 3.7',
                  'Topic :: Software Development :: Libraries :: Python Modules'
                  ]
 )

test_requirements.txt

@@ -2,3 +2,4 @@ nose
 tox
 coveralls
 coverage
+setuptools-scm